These have many analogies with the seed of higher plants.
SYMBIOSIS--A mutual adaptation between parasite and host.
TRANSUDATION--The normal interchange of fluid between the blood and the tissue fluids.

The material interchanged is the transudate.
TROPISM--The influence of forces which direct the movement of cells.
ULTRA-MICROSCOPE--A form of microscope which by means of oblique illumination renders visible objects so small as to be invisible with the ordinary microscope.
VIRUS--A substance either living or formed by living things which may cause disease.
INDEX Amoeba, 13 Anthrax, 109 Antitoxin, 154 Bacteria, 116 adaptation in, 123 aerobic, 122 anaerobic, 122 artificial cultivation of, 119 distribution in nature, 121 growth and reproduction, 118 mode of action in disease, 144 size, 117 spore formation, 118 substances affecting growth of, 123 toxin production by, 144 variations in, 123 Blood, 35 circulation of, 33, 80 vessels, 32 Body, 22 defenses of, 146 organs of, 28 reserve force of, 50 surfaces of, 22 Brain, 31 Cerebro-spinal meningitis, 188 Chemotropism, 93 Cretinism, 37 Darwinism, 240 Death, 57 decomposition after, 51 rigor after, 60 signs of, 59 Disease, 1 action of poisons, 44 acute and chronic, 219 industrialism as factor in, 243 lesions of, 46 superstitions concerning, 10 urban life as factor in, 244 wealth and poverty as factors in, 246 Ductless glands, 37 Embryo, 77 Epilepsy, 209 Eugenics, 215 Foetus, 32 infection of, 200 Foot and Mouth Disease, 129 Glands, 22 Growth, 62 Heart, 33, 221 disease of, 223 Heliotropism, 93 Heredity, 197 influence of alcohol, 206 of insanity, 209 variations and imitations, 204 Hookworm disease, 179 Immunity, 148 theories of, 149 natural, 150 Infection, 135 from external surface, 136 from genito-urinary surface, 137 from lungs, 138 from mouth, 138 from stomach and intestines, 139 from wounds, 141 in children, 195 in wild animals, 191 latent, 166 mixed, 160 racial susceptibility to, 191 resistance to, 143 by air, 170 by insects, 171 Infectious diseases, 97 carriers of, 185 comparison with fermentation, 108 epidemics of, 98 endemic, epidemic and sporadic forms, 188 modes of transmission, 161 Inflammation, 80 acute and chronic, 95 Injury, 54-74 Insanity, 231 causes of, 232 question of increase, 235 Lesion, 17 Leucocytes, 36 migration of, 92 Living matter, 10 Malaria, 175 role of mosquito in transmitting, 178 Malformations, 211 heredity of, 215 Maternal impressions, 212 Nervous system, 228 disease of, 230 effect of social life on, 233 Neurasthenia, 238 Old age, 51 atrophy in, 51 blood vessels in, 54 causes of death in, 56 in animals and plants, 55 mental activity in, 53 Osmosis, 91 Opsonius, 153 Ovum, 201 fertilization of, 198 infection of, 199 Phagocytosis, 86 Plague, 182 transmission by animals, 183 Plasmodium Malariae, 175 Preventive medicine, 242 Protozoa, 124 distribution in nature, 125 mode of growth, 125 sexual differentiation, 125 spore formation, 125 Polyomyelitis, 190 Repair, 46 conditions influencing, 47 Scar, 49 Skin, 21 Sleeping sickness, 173 Smallpox, 187 Spontaneous generation, 106 Sunburn, 83 Syphilis, 193 Tetanus, 142 Thymus, 52 Thyroid, 37 Tonsils, 52 Toxins, 144 Tropisms, 93 Trypanosomes, 172 Tuberculosis, 163 infection by sputum, 169 modes of extension, 163 Tumors, 64 benign and malignant, 69 cells of, 66 color, size and shape, 65 growth of, 65 importance of, 77 origin of, 66 question of increase, 69 theories of cause, 71 treatment of, 77 Typhoid fever, 170 Ultra-microscopic organisms, 128 Virus, 128 Yellow fever, 178 ***END OF THE PROJECT GUTENBERG EBOOK DISEASE AND ITS CAUSES*** ******* This file should be named 15283.txt or 15283.zip ******* This and all associated files of various formats will be found in: http://www.gutenberg.org/dirs/1/5/2/8/15283 Updated editions will replace the previous one--the old editions will be renamed.
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